Question

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Answer 1

Answer:

2 moles of ammonium ions required to combine with 1 mole of oxalate ion to form ammonium oxalate.

Explanation:

Ammonium cation= $NH_4^+$

Oxalate anions =  $C_2O_4^{2-}$

By criss-cross method, the oxidation state of the ions gets exchanged and they form the subscripts of the other ions. This results in the formation of a neutral compound as shown in the image attached.

The ionic compound that formed when ammonium ion and oxalate ions combine is ammonium oxalate.

$2NH_4^++C_2O_4^{2-}\rightarrow (NH_4)_2C_2O_4$

2 moles of ammonium ions required to combine with 1 mole of oxalate ion to form ammonium oxalate.